1. Department of Otorhinolaryngology, University of Duisburg-Essen, University Hospital Essen, Essen, Germany.
2. Department of Otolaryngology, Head and Neck Surgery, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, China.
3. Institute for Experimental Immunology and Imaging, University Hospital Essen, University of Duisburg-Essen, Essen, Germany.
4. Department of Dermatology, University Hospital Essen, University of Duisburg-Essen, Essen, Germany.
5. German Cancer Consortium (DKTK), Partner Site University Hospital Essen, Essen, Germany.